Kinematics

Question 1

7 fundemental units

Answer 1

meters, kilograms, seconds, ampere, mole, kelvin, candela

Question 2

what is precision?

Answer 2

refers to how Small a measurment can be

Question 3

what is accuracy?

Answer 3

refers to how close the measurment is to the expected value

Question 4

percent error

Answer 4

|(theoretical- experimental)/theoretical|x100

Question 5

independent variable

Answer 5

variable that is changed

Question 6

dependent variable

Answer 6

variable that responds

Question 7

line of the best fit

Answer 7

straight line or a smooth curve (not the same as connceting dots)

Question 8

linear relationship

Answer 8

y=mx+b
slope= (y2-y1)/(x2-x1)

Question 9

scalars

Answer 9

quantities that have magnitude ( size)
ex: position, speed, time

Question 10

vectors

Answer 10

quantities that have magnitude and direction
ex: displacement, velocity, force, acceleration

Question 11

what is a position of an object?

Answer 11

a position of an object is its location relative to a starting point

Question 12

what is a distance?

Answer 12

it’s how far smth moves regardless of its starting point

Question 13

Average velocity

Answer 13

is the change in displacement over time interval
SI unit: m/s
v=(df-di)/t

Question 14

average speed

Answer 14

speed doesn’t depend on direction v(not the vector)
v=(df-di)/t

Question 15

what are the 3 things you can do with a graph?

Answer 15

1. read graph
   2.find slope
2. find area

Question 16

what is the difference between the average and instantanious velocity?

Answer 16

the average velocity is the slope of the position- time graph
the instantanious velocity is the slope of the tangent

Question 17

what is acceleration?

Answer 17

a change in velocity is acceleration. (it’s a vector)
a=(vf-vi)/t

Question 18

relations between position/velocity/acceleration time graphs?

Answer 18

a= slope of v=slope of d
d=area of v=area of a